Changed wording in example heading

Author: Ajay Kannan

src/site/resources/index.html

@@ -122,7 +122,7 @@ <h3 class="block-title">What is it?</h3>
 		    up and ready to go. Better yet, if you are running on a Google
 		    Compute Engine instance, the private key is automatically detected.
 
-                  <h4>Retrieve Datastore Entries</h4>
+                  <h4>Example: Retrieve Datastore Entries</h4>
 
                   <div hljs="" language="js">
 		    <pre><code class="hljs java"><span class="hljs-keyword">import</span> com.google.gcloud.datastore.Datastore;